Li Na, Zhang Zong-Wen, Zhang Jia-Ni, Ma Yue, Chen Xiao-Yu, Fan Yang
College of Chemistry and Chemical Engineering, Xinyang Normal University, Xinyang 464000, China.
Dalton Trans. 2021 May 18;50(19):6506-6511. doi: 10.1039/d1dt00774b.
The Ti-based metal-organic framework (Ti-MOF) MIL-125 with tunable crystalline size in the range of ca. 50 nm to 1500 nm was synthesized by the coordination modulation method using trans-cinnamic acid (CA) as a modulator. The coordination modulation also induced hierarchical porosity and structure defects on the nanocrystals. A significant size-dependent catalytic activity towards the oxidative desulfurization (ODS) reaction was observed for these MIL-125 nanocrystals. In particular, the MIL-125 nanocrystals with a mean size of ca. 50 nm exhibit dramatically enhanced catalytic performance for the bulky sulfur compound 4,6-dimethyldibenzothiophene (4,6-DMDBT) compared to the microcrystals. It is demonstrated that the size modulation of MIL-125 is an effective approach to promote its performance for the catalysis of bulky molecules.
以反式肉桂酸（CA）为调节剂，通过配位调制法合成了晶体尺寸在约50nm至1500nm范围内可调的钛基金属有机框架（Ti-MOF）MIL-125。配位调制还在纳米晶体上诱导了分级孔隙率和结构缺陷。观察到这些MIL-125纳米晶体对氧化脱硫（ODS）反应具有显著的尺寸依赖性催化活性。特别是，平均尺寸约为50nm的MIL-125纳米晶体与微晶相比，对大分子硫化合物4,6-二甲基二苯并噻吩（4,6-DMDBT）表现出显著增强的催化性能。结果表明，MIL-125的尺寸调制是提高其对大分子催化性能的有效方法。
